Cavs have identified early-season problem. Now they must fix it.

BOSTON — The Cavs addressed it. They discussed it. It was the focus of Wednesday’s pregame scouting report. Even written on the whiteboard inside the visitor’s locker room at TD Garden.

And yet, when the final buzzer sounded on Boston’s unexpected triumph — a 125-105 rag-dolling — the heavily favored Cavs were on the wrong end of the rebounding battle.